Change end line and column for untyped function defs to line of function definition #13145

Job	Run time
Test mypyc suite with 32-bit Python	6m 47s
Test suite with Python nightly	14m 0s
Test suite with py38-ubuntu, mypyc-compiled	17m 48s
Test suite with py38-windows-64	20m 39s
Test suite with py39-ubuntu	19m 41s
Test suite with py310-ubuntu	15m 46s
Test suite with py311-ubuntu, mypyc-compiled	15m 57s
Test suite with py312-ubuntu, mypyc-compiled	17m 55s
mypyc runtime tests with py39-macos	4m 27s
mypyc runtime tests with py38-debug-build-ubuntu	4m 27s
Type check our own code (py38-ubuntu)	1m 50s
Type check our own code (py38-windows-64)	2m 39s
Formatting and code style with Black + ruff	34s
	2h 22m 30s

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